Economy & Business

Tractor-trailers have 18 wheels. But under current federal law, you can't be 18 years old and drive one across state lines. You have to be 21. The highway bill working its way through the Senate, though, would change that.

President Obama has ordered the development of a supercomputer that is some 20 times faster than the world's current record-holder and is expected to go online by 2025.

A machine at China's National University of Defense Technology in Guangzhou, called Tianhe-2 (Milky Way-2) is thought to currently be the fastest supercomputer in existence — variously reported as doing either 34 or 55 petaflops (1 petaflop is equivalent to 1 quadrillion floating-point operations per second).

Saying that an article on campus rape that was later retracted hurt their reputations and subjected them to needless humiliation, three former members of the Phi Kappa Psi fraternity have sued Rolling Stone, its publisher and the reporter who wrote the story.

Order a rockfish at a restaurant in Maryland, and you'll likely get a striped bass. Place the same order in California, and you could end up with a vermilion rockfish, a Pacific Ocean perch or one of dozens of other fish species on your plate.

This jumble of names is perfectly legal. But it's confusing to diners — and it can hamper efforts to combat illegal fishing and seafood fraud, says the ocean conservation group Oceana.